A good cup of coffee can get you out of bed in the morning. But for heart patients coffee's often on the list of things to avoid. The American Heart Association advises that it might increase the risk of heart failure.

Researchers poured through five studies that followed more than 140,000 European adults, and included information about coffee intake. People who drank about 16 ounces of coffee a day—a grande in Starbucks-speak—had about an 11 percent reduction of the risk of heart failure. People who drink coffee also seem to have less type 2 diabetes, another risk factor for heart disease.

But that doesn't mean it's time to start ordering the venti. In the studies, people who consumed more than 40 ounces a day were at an increased risk for heart failure. More research should filter out the best info, which will percolate down to the public.